Rails migration: change vs up/down 怎麼選
When change is safe, when you must write up/down explicitly
TAG INDEX / Migration
Migration
所有標記為「Migration」的工程筆記。
別在 Docker CMD 裡跑 migration
Why alembic upgrade head / rails db:migrate in CMD deadlocks multi-replica deploys
Rails migration 踩雷：MySQL int vs bigint FK
Why t.references + add_foreign_key can fail on legacy MySQL schemas